|
3 Volt Low Battery Voltage Flasher - This circuit is designed to
monitor two alkaline cells (3v) that form the battery often used in
portable electronic equipment. It use an inexpensive IC from
Panasonic that is connected to an efficient LED flashing circuit.
When the battery voltage drops below a certain point the circuit flashes
the LED. In the off state the circuit draws only 1uA, while in the
active flashing state it draws 20uA. Published in EDN, Jan 2,
1997 [Designed by David A. Johnson] |
3 Xenon flashing circuits found in flash for disposable cameras -
You are going to like this project. It costs less than $3.00, contains six
BUILDING BLOCKS, re-cycles a disposable flash camera and you are going to
learn a lot about electronics.
Everyone has seen a disposable flash camera….(electronic schematic /
circuit added 05/07) |
|
3rd Brake Light Pulser - Several years ago these flashers were
introduced in the automotive industry as part of the third brake light and
contained strobe lights (and strobing continuously for the duration of
pressing the break pedal) but got abandoned almost immediately sometime
later because of the 'strobe' effect it has on some people. This
circuit has become obsolet since much better circuits are available these
days without the 'lag' in between brakes caused by R4 and C3. One of the
circuits is listed below.…. [Tony van Roon's circuit] |
|
|
|
|
3V LED Chaser - ….(electronic schematic added 03/08) |
|
3v Low Battery Voltage Flasher - Many battery powered devices use two AA
alkaline cells. Often you will not know when it is time to replace the batteries
until the device powered by them actually stops operating. The hobby circuit
below can be connected to a 3v battery, to give you some warning when the battery is
nearing its end of life. It will flash a LED when the battery voltage drops to
about 2.4 volts. The electronic circuit draws only 1ua of current in standby
mode and jumps to only 20ua when flashing, so it can safely..... [Hobby Corner Circuit
by Dave Johnson] |
|
40 LED Bicycle Light 555 Timer 6 Volt - The 555 circuit below is a flashing
bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will
alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K
for R1, 150K for R2 and a 1uF capacitor). Time intervals for the two lamps are about
107 milliseconds (T1, upper LEDs) and 104 milliseconds (T2 lower LEDs).....
|
|
6 Channel Auto Reverse Sequential Disco Running Lights - From 230 V AC a DC
supply of + 5 V is obtained. The power supply is given to the other blocks. The pulse
generator at a particular frequency generates the clock pulses. The clock pulses are
counted by a counter and gives output after every 10 pulses.....(circuit diagram added
09/08) |
|
8 Random Flashing LEDs - This project flashes eight LEDs in an apparently
random manner. It uses a 4060 combined counter and display driver IC which is designed
for driving 7-segment LED displays. The sequence is not really random because seven of
LEDs would normally be display segments, eighth LED is driven by an output
that is normally used for driving furr counters.....(added 9/05) |
|
9v neon flasher - Schematic only, no circuit description |
|
9v Powered Xenon Photoflash Controller - This 9v battery powered circuit is
designed for remote control flash needs. A charge control circuit turns off the high
voltage generator when the photoflash capacitor is fully charged. A neon lamp is
included to indicate when the system is ready to flash. …. [Designed by David A.
Johnson] |
|
|
